- Unknown:
- Fr. Rolfe
- Adapted By:
- Rayner Heppenstall
- Produced By:
- Douglas Cleverdon
- George Arthur Rose, later Pope Hadrian VII:
- Max Adrian
- William II, the German Emperor:
- Felix Felton
- Victor Emmanuel III, King of Italy:
- Heron Carvic
- Jerry Sant, a radical demagogue:
- Simon Lack
- Mrs Crowe:
- Marjorie Westbury
- Courtleigh, Cardinal-Archbishop of Pimlico:
- Arthur Ridley
- Talacryn, Bishop of Caerleon:
- John Glyn Jones
- Panciera, Italian Ambassador to the Court of St. James's:
- Lan Sadler
- Cardinal Ragna:
- Geoffrey Wincott
- Cardinal Mundo:
- David Bird
- Cardinal Delia Volta:
- Harold Reese
